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学者姓名：邱豪
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Abstract ：
This study develops a novel framework for investigating thermal degradation in granite by integrating two innovative methodologies for high-precision quantification of fracture toughness. First, a grayscale-based 3D fracture surface reconstruction technique converts SEM images into topographic models through pixel grayscaleheight mapping. This method quantitatively correlates interfacial roughness evolution with thermal exposure (200-800 degrees C), demonstrating a 126 % increase in characteristic grayscale bandwidth (from 35 to 79 units) and revealing mineral-specific thermal cracking mechanisms via CNN-annotated feature transitions. Second, a physics-informed neural network (PINN) framework incorporates fracture mechanics constraints-including stress intensity factors and crack initiation criteria-into a custom loss function. Leveraging a focused dataset, the PINN identifies an explicit thermal degradation factor of beta = 0.0032 for fracture toughness correction. The resulting exponential model achieves superior accuracy (R2 > 0.98, MSE < 0.004) compared to linear and quadratic alternatives, with predictions validated within 5 % error margins across a continuous temperature range of 25-800 degrees C. The exponential form reflects the cumulative nature of thermal microcracking driven by differential mineral expansion. This combined methodology demonstrates: (1) high-precision learning from limited data through CNN-aided feature extraction and PINN regularization; (2) broad applicability, with grayscale reconstruction adaptable to multi-mineral rocks and the beta-factor integrable into ASTM-standard fracture equations; and (3) fundamental advancement in resolving granite's brittle-ductile transition (300-600 degrees C) via quantified micromechanical degradation. The approach establishes a paradigm shift from empirical thermal damage assessment to physics-based prediction, with direct relevance to safety in deep geotechnical engineering within geothermal-active regions.
Keyword ：
Fracture surface reconstruction Fracture surface reconstruction Fracture toughness Fracture toughness Granite mechanics Granite mechanics Physics-informed neural network Physics-informed neural network Thermal degradation Thermal degradation
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| GB/T 7714 | Wang, Chaoxian , Qiu, Hao , Ruan, Yunkai . Granite fracture toughness deterioration under thermal treatment, a new insight from PINN [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
| MLA | Wang, Chaoxian 等. "Granite fracture toughness deterioration under thermal treatment, a new insight from PINN" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 141 (2026) . |
| APA | Wang, Chaoxian , Qiu, Hao , Ruan, Yunkai . Granite fracture toughness deterioration under thermal treatment, a new insight from PINN . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
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Natural rock masses often have dense fracture networks and structural defects, compromising their stability. High-Strength Mortar (HSM) is widely used for grouting reinforcement, but the HSM-rock interface is a potential weak link, especially under dynamic disturbances. This study investigates the fracture behavior of the HSMgranite interface using Bi-material Notched Semi-Circular Bend (BNSCB) specimens. Three-point bending tests under static (0.1 mm/min) and dynamic (2.5 m/s, 3.5 m/s) loading with pre-crack lengths (5, 10, 15 mm) were conducted. Crack propagation velocity was measured via Crack Propagation Gauge (CPG), and interface characteristics were analyzed using SEM-EDS. A cohesive zone model (CZM) was developed in ABAQUS to simulate crack propagation, and complex stress intensity factors (CSIF) were calculated. Results show Interfacial cracks consistently propagated along the HSM-granite boundary, confirming the interface as the weak link due to a porous, calcium-rich Interfacial Transition Zone (ITZ) about 151 mu m wide, identified by EDS. Dynamic loading significantly accelerated crack propagation, with velocities increasing by 417 % to 1579 % compared to static conditions, due to inertial effects and rapid energy accumulation. The fracture was predominantly Mode I, with the effective fracture toughness (Keff) under dynamic loading being 30-40 times greater than under static loading. The Dynamic Increase Factor (DIF) was primarily controlled by the loading rate. Furthermore, a longer pre-crack length (from 5 mm to 15 mm) led to a reduction in Keff by 21 % (dynamic) and 13 % (static), as longer cracks require a lower external load to reach the critical condition. Simulations using a Cohesive Zone Model (CZM) with a bilinear traction-separation law accurately replicated the experimental crack paths and stress distributions, validating the model's capability for simulating high-strain-rate interfacial fracture.
Keyword ：
Crack propagation Crack propagation Fracture toughness Fracture toughness High-strength mortar (HSM) High-strength mortar (HSM) Interfacial fracture Interfacial fracture Numerical simulation Numerical simulation
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| GB/T 7714 | Qiu, Hao , Xie, Chaojie , Hong, Yubin et al. Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
| MLA | Qiu, Hao et al. "Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 141 (2026) . |
| APA | Qiu, Hao , Xie, Chaojie , Hong, Yubin , Chen, Xin , Lai, Guanghong , Wang, Fei . Investigating crack propagation behavior of HSM-granite interface under static and dynamic loading: Experimental and numerical study . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2026 , 141 . |
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本实用新型公开了建筑材料小构件霍普金森压杆系统三点弯曲试验装置，本方案巧妙性通过三点弯曲夹头来进行托持试样，以及利用夹头的一对压头与试样接触配合，再通过霍普金森压杆系统的入射杆施加作用力，使得试样在试验时，其被约束在霍普金森压杆系统的入射杆和与透射杆连接的三点弯曲夹头之间，本方案还巧妙性通过将一对所述压头设置成可拆卸调整间距的结构形式，使得本方案装置可以通过调整一对所述压头的间距来调整对时间的加载间距，其不仅结构简单，且实施可靠、应用灵活，可以应用在建筑材料小构件的动载试验中。
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| GB/T 7714 | 陈宇峰 , 邱豪 , 廖飞宇 et al. 建筑材料小构件霍普金森压杆系统三点弯曲试验装置 : CN202421545213.8[P]. | 2024-07-02 . |
| MLA | 陈宇峰 et al. "建筑材料小构件霍普金森压杆系统三点弯曲试验装置" : CN202421545213.8. | 2024-07-02 . |
| APA | 陈宇峰 , 邱豪 , 廖飞宇 , 谢超杰 , 黄建明 , 李毅鑫 et al. 建筑材料小构件霍普金森压杆系统三点弯曲试验装置 : CN202421545213.8. | 2024-07-02 . |
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本实用新型公开了再生混凝土大构件霍普金森压杆系统三点弯曲实验装置，本方案装置巧妙性通过在机台上设置限位块，在限位块的其一侧面进一步设置一对相对设置的固定压头托架，再通过与霍普金森压杆系统的入射杆连接的活动压头对托架上的试样(活动压头和固定压头之间的试样)进行施加作用力，使得试样的三点弯曲试验不仅实施便利可靠，且本方案还在活动压头和入射杆之间通过过渡件来进一步安装力传感器，使得入射杆在施加作用力时，能够通过力传感器的反馈来及时、高效的记录试验参数。
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| GB/T 7714 | 陈宇峰 , 邱豪 , 廖飞宇 et al. 再生混凝土大构件霍普金森压杆系统三点弯曲实验装置 : CN202421548764.X[P]. | 2024-07-02 . |
| MLA | 陈宇峰 et al. "再生混凝土大构件霍普金森压杆系统三点弯曲实验装置" : CN202421548764.X. | 2024-07-02 . |
| APA | 陈宇峰 , 邱豪 , 廖飞宇 , 谢超杰 , 黄建明 , 李毅鑫 et al. 再生混凝土大构件霍普金森压杆系统三点弯曲实验装置 : CN202421548764.X. | 2024-07-02 . |
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This study explores the dynamic lateral impact performance of Concrete-Filled Steel Tubular (CFST) columns affected by pitting corrosion and strengthened with Carbon Fiber Reinforced Polymer (CFRP). A total of 24 CFST specimens were fabricated and tested, including 9 unstrengthened columns and 15 columns reinforced with varying layers of CFRP wraps. Key variables included corrosion pit depth, pit density, and CFRP layers. Experimental and Finite Element Analysis (FEA) results revealed that pitting corrosion significantly reduces the stiffness and impact resistance of CFST columns by weakening the confinement effect of the steel tube and introducing local stress concentrations. CFRP strengthening effectively mitigates these adverse effects by enhancing stiffness, reducing displacement, and improving the interaction between the steel tube and concrete core. Notably, the benefits of CFRP become more significant with increasing corrosion severity and impact energy. Based on the experimental findings, a simplified design method is proposed to estimate the impact resistance of corroded CFST columns using only their static axial load-bearing capacity and the input kinetic energy, offering a practical approach for engineering assessment.
Keyword ：
CFRP strengthening CFRP strengthening CFST columns CFST columns Experimental tests Experimental tests Finite element analysis Finite element analysis Lateral impact loads Lateral impact loads Pitting corrosion damage Pitting corrosion damage
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| GB/T 7714 | Liao, Feiyu , Huang, Xuankai , Lai, Dade et al. Lateral impact performance of pitting corroded CFST columns with CFRP strengthening [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 232 . |
| MLA | Liao, Feiyu et al. "Lateral impact performance of pitting corroded CFST columns with CFRP strengthening" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 232 (2025) . |
| APA | Liao, Feiyu , Huang, Xuankai , Lai, Dade , Qiu, Hao . Lateral impact performance of pitting corroded CFST columns with CFRP strengthening . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2025 , 232 . |
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| GB/T 7714 | Ma, Yongchao , Chen, Jianxing , Qiu, Hao et al. Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface (vol 131, 104399, 2024) [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
| MLA | Ma, Yongchao et al. "Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface (vol 131, 104399, 2024)" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 133 (2024) . |
| APA | Ma, Yongchao , Chen, Jianxing , Qiu, Hao , Zhuang, Jinping , Zhou, Lei , Wang, Meng . Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface (vol 131, 104399, 2024) . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
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The steel tubes with geopolymer recycled concrete (GRC) infill are actively seeking environmentally friendly and low-carbon building materials as alternatives in the process of promoting sustainable development, maximizing the use of waste materials and resources, and reducing consumption of natural resources and environmental pollution. In this paper, three types of steel tube specimens with GRC infill were proposed, i.e., the geopolymer recycled concrete-filled steel tube (GRCFST), geopolymer recycled concrete-filled double skin steel tube (GRCFDST), and geopolymer recycled concrete-filled double section steel tubes (GRCFDSST). These GRC-steel tube structures were tested under axial compressive loading, and the influence of some crucial factors on bearing capacity, ductility and strain distribution of specimens was considered, such as the slag content, and the types of steel tube section and the replacement rate of recycled aggregate. The experimental results show that the steel tube can provide effective confinement for geopolymer recycled concrete and thus compensate for the adverse effect induced by recycled aggregate. The slag content has less effect on the bearing capacities of the GRCFDSST specimen compared with the GRCFST and GRCFDST specimens due to the stronger confinement effect of the former. The ductility of GRCFDSST specimens is better than the other steel tube specimens under the same parameter conditions. This study, building on existing literature, provides new insights and design recommendations for the mechanical performance of concrete-filled steel tube structures by using geopolymer recycled concrete as a filling material.
Keyword ：
Bearing capacity Bearing capacity Confinement Confinement Ductility Ductility Geopolymer recycled concrete infill Geopolymer recycled concrete infill Steel tube Steel tube
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| GB/T 7714 | Qiu, Hao , Lai, Haopeng , Liao, Feiyu et al. Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 21 . |
| MLA | Qiu, Hao et al. "Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types" . | CASE STUDIES IN CONSTRUCTION MATERIALS 21 (2024) . |
| APA | Qiu, Hao , Lai, Haopeng , Liao, Feiyu , Lai, Dade , Chen, Xin , Chen, Yufeng et al. Mechanical properties of geopolymer recycled concrete infilled steel tubes with three sectional types . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 21 . |
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The propagation behaviour of initial cracks in concrete penetrating the rock-concrete interface is still unclear. This study investigated the behaviour of stress wave-induced crack penetration through the Ultra-High- Performance Concrete (UHPC)-granite interface and crack propagation speed (CPS) using a combination of the crack propagation gauge (CPG) system and a split Hopkinson pressure bar. The influence of loading rate and UHPC strength grade on the dynamic fracture toughness of the penetration crack entire process was analyzed by experimental-numerical method. The results indicate that the Rock-UHPC interface can suppress the crack opening displacement in UHPC, thereby limiting the CPS. The loading rate significantly enhances the dynamic fracture toughness of the penetration crack's entire process. The interface is the boundary point, and the dynamic fracture toughness at the crack tip shows a trend of first increasing and then decreasing. The increase in concrete strength grade can improve the interface dynamic fracture toughness. Compared to the interface roughness, the enhancement effect of concrete grade on the interface dynamic fracture toughness is one order of magnitude higher. For concrete engineering on rock foundations, increasing the concrete strength grade can effectively prevent the inherent crack defects inside the concrete from expanding into the interior of the rock foundation.
Keyword ：
Crack penetration behavior Crack penetration behavior Crack propagation speed Crack propagation speed Dynamic fracture toughness Dynamic fracture toughness UHPC-rock interface UHPC-rock interface Ultra-High-Performance Concrete (UHPC) Ultra-High-Performance Concrete (UHPC)
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| GB/T 7714 | Ma, Yongchao , Chen, Jianxing , Qiu, Hao et al. Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
| MLA | Ma, Yongchao et al. "Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 131 (2024) . |
| APA | Ma, Yongchao , Chen, Jianxing , Qiu, Hao , Zhuang, Jinping , Zhou, Lei , Wang, Meng . Investigation of stress-wave-induced crack penetration behavior at the rock-Ultra-High-Performance Concrete (UHPC) interface . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
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For the ultra-high performance concrete (UHPC) overlaying normal concrete (NC) structures subjected to hightemperature burning, the reliable interface performance between UHPC and NC is the foundation for achieving their good co-work behavior. This paper focused on experimental and theoretical research on crack propagation at the interface of these UHPC-NC configurations under stress waves. A bi-material notched semi-circle bend (BNSCB) configuration was proposed, and the impact experiments were conducted on the BNSCB specimens using a split Hopkinson pressure bar system (SHPB). Three temperatures (20 degrees C, 100 degrees C, and 300 degrees C) were designed in this test, examining the interfacial impact performance of the BNSCB specimen subjected to the hightemperature burning. Based on the finite element method and crack propagation gauge, the dynamic fracture toughness at the crack tip of the interface of the BNSCB specimen was calculated. The results show that: (1) the K1 values for the untreated BNSCB specimens increased by 23.3% and 22.6%, respectively, compared to the heattreated BNSCB specimens. (2) the parameter K2 at the crack tip of the BNSCB specimen is much smaller than K1, and the parameter K1 plays a dominant role in crack initiation; (3) with the increase in loading rate from 580 GPa/s to 740 GPa/s, both untreated and heat-treated BNSCB specimens show significant improvement in the parameters G and K, with a more pronounced improvement observed in untreated compared to heat-treated BNSCB specimens.
Keyword ：
bi -material notched semi -circle bend (BNSCB) bi -material notched semi -circle bend (BNSCB) dynamic fracture toughness dynamic fracture toughness fracture energy fracture energy SHPB system SHPB system UHPC-NC interface UHPC-NC interface
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| GB/T 7714 | Qiu, Hao , Lai, Haopeng , Liao, Feiyu et al. Experimental study on dynamic fracture of UHPC-NC specimens after high temperature burning treatment [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
| MLA | Qiu, Hao et al. "Experimental study on dynamic fracture of UHPC-NC specimens after high temperature burning treatment" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 131 (2024) . |
| APA | Qiu, Hao , Lai, Haopeng , Liao, Feiyu , Chen, Yufeng . Experimental study on dynamic fracture of UHPC-NC specimens after high temperature burning treatment . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 131 . |
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本发明公开了一种模块化再生混凝土河道护岸挡土墙及其制作方法，该挡土墙，包括基台、预制桩与挡墙；基台设置于预制桩的上端，挡墙设置于基台的顶部；挡墙主要由拼接墙体与连接于拼接墙体两侧的混凝土板组成，拼接墙体的首尾两端为第一拼接模块，两侧第一拼接模块分别与两侧混凝土板连接，两侧第一拼接模块之间的中间段由若干第二拼接模块拼接而成；第一拼接模块与第二拼接模块上均设置有若干用于排水的管道，且第一拼接模块与第二拼接模块的衔接处通过自密实混凝土进行固定。本发明不仅能够提升拼接模块之间连接的牢固性，还可有效提升挡土墙的排水能力，有利于填土中水的排出，适宜进一步推广应用。
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| GB/T 7714 | 黄建明 , 邱豪 , 廖飞宇 et al. 模块化再生混凝土河道护岸挡土墙及其制作方法 : CN202411345289.0[P]. | 2024-09-26 . |
| MLA | 黄建明 et al. "模块化再生混凝土河道护岸挡土墙及其制作方法" : CN202411345289.0. | 2024-09-26 . |
| APA | 黄建明 , 邱豪 , 廖飞宇 , 陈辰 , 赖浩鹏 , 李毅鑫 et al. 模块化再生混凝土河道护岸挡土墙及其制作方法 : CN202411345289.0. | 2024-09-26 . |
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